linux-kernel - Re: [PATCH 1/2] dt-bindings: phy: Add Freescale i.MX8qm Mixel LVDS PHY binding

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Date:   Sun, 19 Jun 2022 14:11:54 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Liu Ying <victor.liu@....com>, linux-phy@...ts.infradead.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Cc:     kishon@...com, vkoul@...nel.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, shawnguo@...nel.org,
        s.hauer@...gutronix.de, kernel@...gutronix.de, festevam@...il.com,
        linux-imx@....com
Subject: Re: [PATCH 1/2] dt-bindings: phy: Add Freescale i.MX8qm Mixel LVDS
 PHY binding

On 18/06/2022 11:22, Liu Ying wrote:
> This patch adds bindings for Mixel LVDS PHY found on
> Freescale i.MX8qm SoC.
> 
> Signed-off-by: Liu Ying <victor.liu@....com>
> ---
>  .../bindings/phy/mixel,lvds-phy.yaml          | 64 +++++++++++++++++++
>  1 file changed, 64 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/phy/mixel,lvds-phy.yaml
> 
> diff --git a/Documentation/devicetree/bindings/phy/mixel,lvds-phy.yaml b/Documentation/devicetree/bindings/phy/mixel,lvds-phy.yaml
> new file mode 100644
> index 000000000000..de964ffb9356
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/phy/mixel,lvds-phy.yaml
> @@ -0,0 +1,64 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/phy/mixel,lvds-phy.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Mixel LVDS PHY for Freescale i.MX8qm SoC

If Mixel is a vendor, it needs it's vendor prefix documented and used in
compatible. Filename should match compatible. If it is not a vendor,
then filename should be "fsl,imx8qm-lvds-phy.yaml"

> +
> +maintainers:
> +  - Liu Ying <victor.liu@....com>
> +
> +description: |
> +  The Mixel LVDS PHY IP block is found on Freescale i.MX8qm SoC.
> +  It converts two groups of four 7/10 bits of CMOS data into two
> +  groups of four data lanes of LVDS data streams. A phase-locked
> +  transmit clock is transmitted in parallel with each group of
> +  data streams over a fifth LVDS link. Every cycle of the transmit
> +  clock, 56/80 bits of input data are sampled and transmitted
> +  through the two groups of LVDS data streams. Together with the
> +  transmit clocks, the two groups of LVDS data streams form two
> +  LVDS channels.
> +
> +  The Mixel LVDS PHY found on Freescale i.MX8qm SoC is controlled
> +  by Control and Status Registers(CSR) module in the SoC. The CSR
> +  module, as a system controller, contains the PHY's registers.
> +
> +properties:
> +  compatible:
> +    const: fsl,imx8qm-lvds-phy
> +
> +  "#phy-cells":
> +    const: 1
> +    description: |
> +      Cell allows setting the LVDS channel index of the PHY.
> +      Index 0 is for LVDS channel0 and index 1 is for LVDS channel1.
> +
> +  clocks:
> +    maxItems: 1
> +
> +  clock-names:
> +    const: phy_ref

Maybe just skip the clock-names, it's not bringing anything useful,
unless you expect some more clocks to be documented later? (but in such
case question would be why they are not documented now)

> +
> +  power-domains:
> +    maxItems: 1
> +
> +required:
> +  - compatible
> +  - "#phy-cells"
> +  - clocks
> +  - clock-names
> +  - power-domains
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/firmware/imx/rsrc.h>
> +    phy {
> +        compatible = "fsl,imx8qm-lvds-phy";
> +        #phy-cells = <1>;
> +        clocks = <&clk IMX_SC_R_LVDS_0 IMX_SC_PM_CLK_PHY>;
> +        clock-names = "phy_ref";
> +        power-domains = <&pd IMX_SC_R_LVDS_0>;
> +    };


Best regards,
Krzysztof